JP2799915B2 - Other excitation type parametric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called parametric motor using a rotating magnetic field by an orthogonal magnetic path.

[0002]

2. Description of the Related Art The present inventors have disclosed a technique disclosed in Japanese Patent Application Laid-Open No.
Publication No. JP-A No. 11-216, etc. have proposed a parametric motor using parametric oscillation. The basic configuration will be described with reference to FIG. Both ends of the U-shaped magnetic core A ₁ are connected to one end of one diameter in the axial direction of the cylindrical common magnetic path B,
Further connects the common magnetic path other ends of the U-shaped magnetic core A ₂ in the axial direction of the other in both end positions of the diameter spatial position is shifted substantially 90 ° with the U-shaped magnetic core A ₁ of B, U-shaped magnetic core and a _1, a ₂ each primary magnetic core and secondary magnetic core, primary core a ₁
And a secondary winding 4 in which a tuning capacitor (not shown) is connected in parallel to the secondary core A ₂ , and the primary and secondary windings 3, 4 It is configured such that the time phases of the two applied and induced voltages are shifted by 90 °. When applying an AC input voltage to the primary winding 3 in the above structure, when it becomes more than a certain AC input voltage value, a common magnetic path B and the primary side core A ₁ is periodically magnetically saturated. Therefore, the inductance of the circuit of the common magnetic path B with the bound secondary cores A ₂ wound around it are secondary winding 4 periodically changes. As a result, a parametric oscillation occurs, and the inductance of the circuit of the secondary winding 4 of the secondary magnetic core A ₂ shifted by 90 ° from the primary magnetic core A ₁ and a capacitor connected in series to this circuit are AC-input. If it is tuned to the frequency, a secondary voltage that is approximately 90 ° out of phase with the AC input voltage is induced in the secondary winding 4. The composite magnetic flux generated by the AC input voltage and the secondary voltage generates a rotating magnetic field, and the rotor 9 is rotated by the rotating magnetic field. S is the rotor shaft.

[0003]

However, such a conventional parametric motor has a simple structure and can be supplied at a low cost, but is not suitable for applications requiring a high degree of control of the number of revolutions. SUMMARY OF THE INVENTION It is an object of the present invention to provide a motor utilizing parametric oscillation which is easy to control the number of revolutions including forward rotation, reverse rotation and the like and is excellent in efficiency.

[0004]

According to the present invention, there is provided a magnetic body having a through hole, and a first body having both ends connected to one end of one end of the circular hole at one axial end surface of the magnetic body. The magnetic yoke and the one diameter are substantially 90 ° on the opposite surface of the magnetic body in the axial direction.
A second magnetic yoke having both ends connected to both ends of the shifted diameter, a first winding for AC application wound on the first magnetic yoke, and a second magnetic yoke wound on the second magnetic yoke. Exchange
A second winding for application, a rectifier circuit for full-wave rectification of the alternating current applied to the first winding, and an alternating voltage phase-adjusted by receiving the full-wave rectified output of the rectifier circuit and applying the alternating voltage to the first winding. A separately excited parametric motor having an inverter with a phase adjusting device for applying a voltage to a line is obtained.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a parametric motor according to another embodiment of the present invention. FIG. 1 is a perspective view showing a basic configuration of a motor body, and has a configuration described in the related art. However, the difference from the prior art is that a capacitor is not connected to the secondary winding 4 and is open. FIG. 2 is a basic connection diagram of the other excitation type parametric motor of the present invention, and the motor body is shown by an equivalent circuit. As is clear from the figure, the commercial frequency power supply 6 is applied to both the primary and secondary windings 3, 4. However, on the primary side, the full-wave rectifier circuit 1 performs full-wave rectification of the sine-wave AC voltage (FIG. 3A) from the commercial frequency power supply as shown in FIG. And converted to a direct current as shown in FIG. After converting this DC into a square wave alternating voltage whose phase can be adjusted by the inverter 2 configured by a thyristor,
It is supplied to the primary winding 3 via the switch SW. In addition,
Square wave inverter 2 is separately excited, it is added to the trigger pulse generator 5 through the switch e _p. The trigger pulse generator 5 has a phase adjusting element, and generates a trigger pulse with a phase adjusted by this element. The square wave inverter is excited by a trigger pulse from the trigger pulse generator 5, and generates a square wave alternating voltage synchronized with the phase. With the above configuration, the primary input voltage e ₁ can be adjusted in phase with respect to the voltage of the commercial frequency power supply 6. Although FIG. 3 (C) includes some pulsating flow, there is almost no problem in operation even with a voltage including some pulsating flow due to the characteristics of the parametric motor.
The secondary winding 4, the voltage of the commercial frequency power supply 6 is adapted to be supplied via the switch SW _2.

Next, a simulation was performed on a rotating magnetic field generated in the annular magnetic core when the phases of the primary side input voltage e ₁ and the secondary side input voltage e ₂ were changed. FIG. 4 shows the primary input voltage e ₁ and the secondary input voltage e in this experiment.
FIG. 6 is a diagram defining a phase delay angle θ of ₂ ; (A)
The figure shows θ = 0, the figure (b) shows θ = 90 °, and the figure (c) shows θ = −.
The case of 90 ° is shown. Figure 5 is a temporal change of the primary magnetic flux phi ₁ associated therewith a primary side input voltage e1 to the right,
On the lower side, the secondary side input voltage e ₂ and the secondary side magnetic flux φ ₂ associated therewith
And the resultant magnetic flux φ _R is shown at the center. The magnetic flux is a value obtained by integrating the voltages, and it is understood that when each of them is combined, a substantially circular rotating magnetic field is generated when the phase difference between e ₁ and e ₂ is + 90 °. FIG.
In results of the same synthetic _one and phase difference e ₂ as -90 °, confirmed that substantially circular synthetic rotating magnetic field phi _R as obtained in Figure 5 is generated in the direction opposite to that of FIG. 5 did it.
7 and 8 show that the phase difference between e ₁ and e ₂ is + 45 ° and −45 °.
The composite magnetic field in the case of is shown. In this case, the phase difference is 90
The combined magnetic field φ _R, as in the case of ° is not a beautiful circle, but the rotating magnetic field was confirmed to occur. To include many harmonic this composite magnetic field phi _R is 5 the magnitude of the fundamental wave magnetic field becomes smaller than in the case of FIG. 6, when the load is the same, the rotational speed of the rotor 5, 6 Is considered to be lower than the value of. From the above relationship, the phase difference θ and the rotation speed (N)
9 and 1 show qualitatively the relationship between power and power (P).
It looks like 0. From these figures, it can be seen that the separately excited parametric motor according to the present invention can easily control the number and direction of rotation of the motor by adjusting the phase of the square wave alternating voltage (ie, by adjusting θ). You can see that there is.

[0007] Based on the above simulation results, the present inventor conducted a demonstration experiment. First, the primary-side input voltage E ₁
= 100 [V] (effective value), secondary side input voltage E ₂ = 10
0 [V] (commercial power supply), maximum output Po _max = 150
[W], a conventional parametric motor having a maximum efficiency η _{m of} approximately 50 (%) was prototyped, and the primary and secondary windings 3, 4 were connected in the same manner as in FIG. Was. FIG.
Is the actual measurement of the relationship between the phase difference θ between e ₁ and e ₂ and the starting torque. According to the simulation result, the starting torque is zero when the input voltages on the primary side and the secondary side are in phase, ± 90 ° phase difference between primary and secondary input voltage
, The maximum torque in the opposite direction is shown. FIG.
2 is an example of actual measurement of the number of revolutions of the rotor when the phase of the primary-side input voltage is changed. In this case, too, according to the simulation result, the rotation is performed when the primary-side and secondary-side input voltages are in phase. When the number is zero and the phase difference is ± 90 °, it indicates the maximum rotational speed in the opposite direction. This result was actually confirmed that it is possible to speed control including forward, reverse rotational direction by adjusting the phase difference between the primary-side input voltage e ₁ and the secondary-side input voltage e _2. FIG. 13 is an example in which the relationship between the primary-side input power P ₁ and the secondary-side input power P ₂ and the phase difference θ at the time of restraint is actually measured. I do. FIG. 14 is a diagram showing a torque series characteristic when θ = 90 °. In FIG. 14, the waveform is distorted due to crawling. From this measurement result, it can be confirmed that the present apparatus is operating as an induction motor.

[0008]

As described above, the separately-excited parametric motor according to the present invention has excellent rotational speed control, good efficiency, and has various features as described below. (1) Due to the separately excited parametric oscillation, the oscillation is forcibly driven, stable, and no capacitor is required. (2) By adjusting the phase of the square-wave inverter, it is possible to easily control the number of rotations of the electric motor including forward rotation and reverse rotation. Of course, e ₁ operates normally be a sine wave alternating voltage. (3) A constant-speed rotation can be performed irrespective of a load variation by automatically adjusting a trigger pulse of the square-wave inverter by detecting a variation in the number of revolutions. (4) In the conventional self-excited type, the energy of the secondary circuit is supplied from the primary circuit via a magnetic path, but in the separately-excited type of the present invention, the energy is directly supplied to the secondary circuit from the power supply. The separately-excited type is more efficient. (5) It can be used as an inexpensive and precise control motor using an AC machine. (6) Because the motor uses parametric oscillation,
Even if the primary side has a square wave input, the output and efficiency hardly decrease. (7) Since a regular voltage is always applied to the secondary side, the establishment of a rotating magnetic field is quicker than in a conventional self-excited motor,
Therefore, the starting is quicker.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a parametric motor main body of the present invention.

FIG. 2 is a basic connection diagram of the other excitation type parametric motor of the present invention.

FIG. 3 is a diagram showing a voltage rectification process. (A) The voltage waveform diagram of a commercial frequency power supply. (B) Voltage waveform diagram after full-wave rectification. (C) DC voltage waveform diagram after passing through a smoothing circuit.

FIG. 4 is a diagram showing the definition of the phase difference θ between the primary and secondary voltages of the motor according to the present invention. (A) When θ = 0. (B) When θ = 90 °. (C) When θ = −90 °.

FIG. 5 is a diagram showing a synthetic magnetic field (a phase difference between e1 and e2 + 90 °).

FIG. 6 is a view showing a synthetic magnetic field (a phase difference of -90 ° between e1 and e2).

FIG. 7 is a diagram showing a synthetic magnetic field (a phase difference between e1 and e2 + 45 °);

FIG. 8 is a view showing a synthetic magnetic field (a phase difference of −45 ° between e1 and e2).

FIG. 9 is a diagram showing a change in the number of rotations due to a phase difference θ.

FIG. 10 is a diagram showing a change in power due to a phase difference θ.

FIG. 11 is a diagram showing the relationship (actually measured values) between the phase difference θ and the starting torque.

FIG. 12 is a diagram showing a relationship (actually measured values) between the phase difference θ and the number of rotations.

FIG. 13 is a diagram illustrating a relationship between inputs P1 and P2 and a phase difference during constraint.

FIG. 14 is a diagram showing torque-speed characteristics when the phase difference is 90 °.

[Explanation of symbols]

A ₁ Primary U-shaped core A ₂ Secondary U-shaped core B Common magnetic path, annular core S Shaft 1 Full-wave rectifier circuit 2 Square-wave inverter 3 Primary winding N1 4 Secondary winding N2 5 With phase adjustment dial Trigger pulse generator 6 Commercial frequency power supply 7 Primary switch SW1 8 Secondary switch SW2 9 Rotor

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Satoshi Sakamoto 2-2-2-2 Nejo, Hachinohe City, Aomori Prefecture (56) References JP-A-55-144769 (JP, A) JP-A-62-37092 (JP, A) JP-A-2-79755 (JP, A) JP-A-63-167440 (JP, U) U.S. Pat.

Claims (1)

(57) [Claims] 1. A magnetic body having a through hole, a first magnetic yoke having both ends connected to one end of one end of the circular hole at one axial end surface of the magnetic body, and an axial direction of the magnetic body. A second magnetic yoke having opposite ends connected at opposite ends of a diameter substantially 90 ° from the one diameter on the opposite surface, a first winding for AC application wound on the first magnetic yoke, A second winding for AC application wound around the second magnetic yoke, a rectifier circuit for full-wave rectification of the AC applied to the first winding, and a full-wave rectified output of the rectifier circuit; A separately-excited parametric motor having an inverter with a phase adjustment device for applying the alternating voltage, phase-adjusted to the first winding.